Ferrite compositions

Patent metadata

Field	Value
Publication number	US-10919802-B2
Application number	US-201715852046-A
Country	US
Kind code	B2
Filing date	Dec 22, 2017
Priority date	Jan 14, 2013
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

Ferrite compositions, particularly ferrite coated substrates and more particularly fibre plys coated with ferrites in fibre reinforced polymer composites (FRPC), and composites with a plurality of functionalised fibre layers, include a magnetic ferrite composition for coating a substrate, said composition comprising a resin, and dispersed therein ferrite particulates, wherein said ferrite particulates have an average longest dimension of less than 500 nm. The composition may be used to provide a ferrite composite structure comprising at least one fibre ply, with at least one layer of a magnetic ferrite composition disposed thereon, wherein said ply is substantially encapsulated in a binder matrix to form a fibre reinforced polymer composite.

First claim

The invention claimed is:

1. A method of manufacturing a ferrite composite structure comprising at least one glass fibre ply, the method comprising:
causing heating of the at least one glass fibre ply to a softening point of the at least one glass fiber ply, thereby forming at least one softened glass fiber ply;
embedding a magnetic ferrite powder in the at least one softened glass fibre ply, wherein particles of the magnetic ferrite powder have an average longest dimension of less than 500 nm;
causing the at least one softened glass fibre ply to cool, thereby forming at least one cooled glass fibre ply;
encapsulating the at least one cooled glass fibre ply in a binder matrix, such that the binder matrix directly contacts the at least one cooled glass fibre ply; and
causing a cure of the binder matrix, thereby forming a fibre-reinforced composite.

2. The method of claim 1 , wherein the magnetic ferrite powder is embedded in the at least one softened glass fibre ply by spraying the magnetic ferrite powder.

3. The method of claim 1 , further comprising shaping the fibre-reinforced composite to form a structural panel.

4. The method of claim 1 , wherein at least 40% v/v of the magnetic ferrite powder is embedded in the at least one softened glass fibre ply.

5. The method of claim 1 , wherein the magnetic ferrite powder is dispersed within a solvent.

6. The method of claim 1 , wherein the average longest dimension of the particles of the magnetic ferrite powder is in a range from 50 to 150 nm.

7. The method of claim 1 , wherein said magnetic ferrite powder is embedded in the at least one softened glass fibre ply in an array pattern.

8. A method of manufacturing a ferrite composite structure comprising at least one glass fibre ply, the method comprising:
causing heating of the at least one glass fibre ply to a softening point of the at least one glass fiber ply, thereby forming at least one softened glass fiber ply;
embedding a magnetic ferrite composition in the at least one softened glass fibre ply, the magnetic ferrite composition comprising a resin and a plurality of ferrite particulates, wherein the ferrite particulates of the magnetic ferrite composition have an average longest dimension of less than 500 nm;
causing the at least one softened glass fibre ply to cool, thereby forming at least one cooled glass fibre ply;
encapsulating the at least one cooled glass fibre ply in a binder matrix, such that the binder matrix directly contacts the at least one cooled glass fibre ply; and
causing a cure of the binder matrix, thereby forming a fibre-reinforced composite.

9. The method of claim 8 , wherein the magnetic ferrite composition is embedded in the at least one softened glass fibre ply by spraying the magnetic ferrite composition.

10. The method of claim 8 , further comprising shaping the fibre-reinforced composite to form a structural panel.

11. The method of claim 8 , wherein at least 40% v/v of the ferrite particulates are embedded in the at least one softened glass fibre ply.

12. The method of claim 8 , wherein the average longest dimension of the ferrite particulates is in a range from 50 to 150 nm.

13. The method of claim 8 , wherein said magnetic ferrite composition is embedded in the at least one softened glass fibre ply in an array pattern.

14. A method of manufacturing a ferrite composite structure comprising at least one glass fibre ply, the method comprising:
coating a magnetic ferrite powder over at least a portion of the at least one glass fibre ply, wherein particles of the magnetic ferrite powder have an average longest dimension of less than 500 nm;
causing the at least one glass fibre ply having the magnetic ferrite powder to cool, thereby forming at least one cooled glass fibre ply;
encapsulating the at least one cooled glass fibre ply in a binder matrix, such that the binder matrix directly contacts the at least one cooled glass fibre ply; and
causing a cure of the binder matrix, thereby forming a fibre-reinforced composite.

15. The method of claim 14 , wherein the magnetic ferrite powder is coated on the at least one glass fibre ply by spraying the magnetic ferrite powder.

16. The method of claim 14 , further comprising shaping the fibre-reinforced composite to form a structural panel.

17. The method of claim 14 , wherein at least 40% v/v of the magnetic ferrite powder is embedded in the at least one glass fibre ply.

18. The method of claim 14 , wherein the magnetic ferrite powder is dispersed within a solvent.

19. The method of claim 14 , wherein the average longest dimension of the particles of the magnetic ferrite powder is in a range from 50 to 150 nm.

20. The method of claim 14 , wherein said magnetic ferrite powder is coated on the at least one glass fibre ply in an array pattern.

Assignees

• Bae Systems Plc

Inventors

• Haq Sajad
• Dunleavy Michael
• Dyke Hazel Anne
• Dyke Amy Elizabeth

Classifications

• D06M11/49 Primary

  Oxides or hydroxides of elements of Groups 8, 9,10 or 18 of the Periodic Table; Ferrates; Cobaltates; Nickelates; Ruthenates; Osmates; Rhodates; Iridates; Palladates; Platinates · CPC title

• C08J5/10

  characterised by the additives used in the polymer mixture · CPC title

• C08K3/22

  of metals · CPC title

• C08K2003/2265

  of iron · CPC title

• C03C25/46

  Metals · CPC title